On lör, 2010-08-07 at 16:47 +0100, Mike Fowler wrote: > To be honest I'm happiest with returning a boolean, even if there is > some confusion over content only being valid. Though changing the > return > value to DOCUMENT/CONTENT/NULL makes things a touch more explicit, > the > same results can be achieved by simply running: > > SELECT data::xml FROM mixed WHERE xml_is_well_formed(data) AND > data::xml IS DOCUMENT;
Note that this wouldn't necessarily work because it is not guaranteed that the well-formedness test is executed before the cast to xml. SQL doesn't short-circuit left to right. (A CASE expression could work.) -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
